<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1 == 0 ? 'bdtop' : '','vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{ item1.authName }}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染二级权限 -->
                <el-row :class="[i2 == 0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                   <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{ item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                      <!-- 通过for循环嵌套渲染三级权限-->
                      <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                          {{item3.authName}} 
                      </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>
                  {{ scope.row }}  
            </pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
  title="分配权限"
  :visible.sync="setRightDialogVisible"
  width="50%" @close="setRightDialogClosed">
  <!-- 树形控件 -->
  <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //所有角色列表数据
      rolelist: [],
      //控制分配权限对话框的显示与隐藏
      setRightDialogVisible:false,
      //所有权限的数据
      rightslist:[],
      //树形控件的属性绑定对象
      treeProps:{
          label:'authName',
          children:'children'
      },
      //默认选中的节点id值数组
      defKeys:[],
      //当前即将分配权限的角色id
      roleId:'',
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    //获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get(`roles`)

      if (res.meta.status !== 200) {
        return this.$message.error(`获取角色列表失败! `)
      }

      this.rolelist = res.data

      //console.log(this.rolelist)
    },
    //根据Id删除对应的权限
    async removeRightById(role,rightId){
     //弹框询问用户是否删除数据
     const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
        ).catch(err=>err)
        //如果用户确认删除,则返回值为字符串confirm
        //如果用户取消删除,则返回值为字符串cancel
         //console.log(confirmResult);
         if(confirmResult !=='confirm'){
           return this.$message.info(`已取消删除`)
         }
       const{data:res} = await this.$http.delete(`roles/${role}/rights/${rightId}`)

       if(res.meta.status!==200){
         return this.$message.error(`删除权限失败`)
       }
       this.$message.success(`删除权限成功! `)
       //this.getRoleList()
       //将服务器返回的最新权限列表直接赋值给当前角色的children
       role.children = res.data
    },
    //展现分配权限的对话框
    async showSetRightDialog(role){
      this.roleId = role.id;
        //获取所有权限的数据
       const{data:res} = await this.$http.get(`rights/tree`)
       if(res.meta.status!==200){
           return this.$message.error(`获取权限数据失败! `)
       }
       //获取到的权限数据保存到data中
        this.rightslist = res.data
        //console.log(this.rightslist);
        //递归获取三级节点的Id
        this.getLeafKeys(role,this.defKeys)

        this.setRightDialogVisible = true
    },
    //通过递归的形式,获取角色下所有三级权限的id,并保存到defKeys数组中
    getLeafKeys(node,arr){
      //如果当前node节点不包含children属性,则是三级节点
      if(!node.children){
        return arr.push(node.id)
      }
      node.children.forEach(item=>
      this.getLeafKeys(item,arr))
    },
    //监听分配权限对话框的关闭时间
    setRightDialogClosed(){
      this.defKeys=[];
    },
    //点击为角色分配权限
   async allotRights(){
      const keys = [
      ...this.$refs.treeRef.getCheckedKeys(),
      ...this.$refs.treeRef.getHalfCheckedKeys() 
      ]
      const idStr = keys.join(',')
     const{data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})
    
     if(res.meta.status !==200){
       return this.$message.error(`分配权限失败`)
     }
     this.$message.success(`分配权限成功! `)
     this.getRolesList()
     this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}
</style>